I have a 2000 ford explorer that wil not start after i have replaced the starter. It just clicks

That sounds like a bad connection was made during those upgrades. Here are the wiring diagrams.

https://www.google.com/search?q=1993+ford+explorer+starter+wiring+diagram

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There is a start/run relay in the underhood fusebox

STARTER PROBLEMS

It can be faulty starter or there is loose connection from battery to starter. The starter assembly gets power from battery. Check voltages at starter wires and see if you are getting 12 volts or not. If not then its no power issue due to low battery volt or no connection between battery to starter.

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To solve these problem, I suggest you to refer these direct help links:-----

Click the link below: ------

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How to test starter solenoid?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-starter-solenoid.html

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How to test cars starter?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-cars-starter.html

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How to replace starter in car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-starter-in-car.html

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These will help.

Thanks.

Since you changed your ignition switch, u might need to check the starter motor, if the starter motor pinion is jammed in flywheel ring gear. it can cause this. Also look at the starter motor solenoid.

sounds like the starter, if the battery is good, have someone tap on the starter while the ignition is turned. You can pull the starter off and a auto parts store can check it out. Hope This Helped Tim

Fords usually have a starter solenoid separate from the starter. If the contacts are bad in the solenoid it will make the clicking sound. Replace the solenoid and it will start.

If your starter don't do anything (crank) like a dead battery, then its going to be your starter, if it cranks but don't start the engine, then it could be your eec relay.

Sounds like the starter is bad. Next time it does it hit the starter a few times with a hammer, if it starts right away replace the starter.

P.S.
Check you positive side cable for corrosion and you might need to replace the cable because it runs from the battery direct to the starter and to the starter relay that is mounted on the right front fender under the hood. You have 2 (two) starter relays on your Explorer.

The next thing to check is 1: The starter solenoid (usually on the fender with batt. wire connected to it)
2: Use a breaker bar and manually turn engine at center crank bolt (clockwise). Either the solenoid is out or you have something more $/serious with the engine mechanically.